[LyX/2.3.x] Fix bug #11180

[Scott Kostyshak]

On Thu, Oct 04, 2018 at 06:48:12AM +0200, Richard Kimberly Heck wrote:
> commit ea81faa911fc2561a017eb36c3a3d0bbe5b86756
> Author: Enrico Forestieri <forenr at lyx.org>
> Date:   Sun Jun 24 20:06:40 2018 +0200
> 
>     Fix bug #11180
>     
>     When a raster image with an advertised pixel density different
>     from 72 dpi is included in a latex file, the output image dimensions
>     are scaled by the ratio 72/pixel_density. Hence, if a clipping
>     bounding box is specified, it has to be scaled by the same ratio,
>     otherwise the images will be clipped differently on screen and output.
>     Here we use the extractbb command (present in any TeX distribution)
>     to ask about the output dimensions of the image as dictated by the
>     pixel density and compute the scaling ratio by the knowledge of the
>     actual dimensions. If, for whatever reason, extractbb is not found,
>     everything goes as before, because the clipping bounding box will
>     simply not be corrected.
>     
>     (cherry picked from commit 380f34a11485c41d812695dc4279b24a5ed5cc07)
> ---

A bisect on 2.3.x lead me here. I see the same behavior on master. To
reproduce, download the attached files and open the .lyx file and view
as PDF (pdflatex). The image is clipped differently than before this
commit. Strangely, if I export on the command line (with -e pdf2),
things work as before.

Scott
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